diff options
| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-12-05 00:35:38 -0500 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2006-12-06 10:46:36 -0500 |
| commit | 49a70f278658894d2899824cd4037095fb6711fe (patch) | |
| tree | 8fc0e55be04a421ee9091a989c30807d891d7930 /fs/nfs/internal.h | |
| parent | 277459d2e2cd40594967757e8fd016c4c7016614 (diff) | |
NFS: Cleanup: add common helper nfs_page_length()
Clean up a lot of ad-hoc page length calculations in fs/nfs/write.c
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/internal.h')
| -rw-r--r-- | fs/nfs/internal.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index d205466233f..a28f6ce2e13 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -217,3 +217,21 @@ void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) sb->s_maxbytes = MAX_LFS_FILESIZE; } + +/* + * Determine the number of bytes of data the page contains + */ +static inline +unsigned int nfs_page_length(struct page *page) +{ + loff_t i_size = i_size_read(page->mapping->host); + + if (i_size > 0) { + pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; + if (page->index < end_index) + return PAGE_CACHE_SIZE; + if (page->index == end_index) + return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; + } + return 0; +} |